Back to the maker to ask what's up or for settings. This are rather bad things. That is, many times they don't work and cost as much as a HDMI display or TV.
I bought a HDMI to VGA adapter with a 3.5 mm jack for audio. I plugged the male HDMI end into my Xbox 360 and the female end I connected to a VGA cable and the VGA cable to the monitor. I connected an aux cord to the adapter which is connected to a small speaker, the video is working but not the audio. please help.